Durability of Resin-Modified Glass Ionomer Cements after Long Term Water Immersion

• Published in: The Journal of Showa University Dental Society Vol. 21; no. 1; pp. 178 - 185
• Main Authors: FUJISHIMA, Akihiro, IKEDA, Kuniko, AOYAMA, Mariko, MIYAZAKI, Takashi, SASA, Ryuji, FERRACANE, Jack L.
• Format: Journal Article
• Language: English; Japanese
• Published: Showa University Dental Society 2001
• Subjects: durability; mechanical properties; reduction rate; resin-modified glass ionomer cement; thermal cycling
• ISSN: 0285-922X; 2186-5396
• DOI: 10.11516/dentalmedres1981.21.178

The aim of this study was to evaluate the durability of three resin-modified glass ionomer (RMGI) cements (Vitrebond, Vitremer, and Fuji II LC) as compared with a conventional acid-base glass ionomer (ABGI) cement for a restorative use (Fuji II). All specimens were stored in deionized water from one month up to one year. Compressive strength, direct tensile strength (with thermal cycling), diametral tensile strength, and fracture toughness were measured. Durability was quantitated as the reduction in strength from the highest value. ABGI cement showed brittle fracture for all periods. RMGI cement initially showed some plasticity that decreased with increased aging time. Tensile strengths of all cements measured by the diametral test were significantly higher than those measured by the direct tensile test. Because of the deformation of specimens under compression, we suggest use of the direct tensile test for an evaluation of the tensile strength of RMGI. All measured properties of the RMGI cements were greater than those of the ABGI cement during all periods. However, the reduction in properties for the RMGI cements was slightly greater than that of the ABGI cement (with the exception of compressive strength). These results suggest that RMGI cements may be more suitable restoratives because of their enhanced strength, but further investigation of the durability of these cements in stress-bearing areas is needed.